---
title: ConfigurableFakeBackend (v0.46)
description: API reference for qiskit.providers.fake_provider.ConfigurableFakeBackend in qiskit v0.46
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/0.46/qiskit.providers.fake_provider.ConfigurableFakeBackend
---

# ConfigurableFakeBackend

*class* `qiskit.providers.fake_provider.ConfigurableFakeBackend(name, n_qubits, version=None, coupling_map=None, basis_gates=None, qubit_t1=None, qubit_t2=None, qubit_frequency=None, qubit_readout_error=None, single_qubit_gates=None, dt=None, std=None, seed=None)`

[GitHub](https://github.com/qiskit/qiskit/tree/stable/0.46/qiskit/providers/fake_provider/utils/configurable_backend.py)

Bases: [`FakeBackend`](/docs/api/qiskit/0.46/providers_fake_provider#qiskit.providers.fake_provider.FakeBackend "qiskit.providers.fake_provider.fake_backend.FakeBackend")

Configurable backend.

Creates backend based on provided configuration.

> **Deprecated since version 0.46.0**
>
> The class `qiskit.providers.fake_provider.utils.configurable_backend.ConfigurableFakeBackend` is deprecated as of qiskit 0.46.0. It will be removed in qiskit 1.0. Use a suitable FakeBackend instead.

**Parameters**

- **name** ([*str*](https://docs.python.org/3/library/stdtypes.html#str)) – Name of the backend.
- **n\_qubits** ([*int*](https://docs.python.org/3/library/functions.html#int)) – Number of qubits in the backend.
- **version** ([*str*](https://docs.python.org/3/library/stdtypes.html#str) *| None*) – Version of the fake backend.
- **coupling\_map** ([*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*int*](https://docs.python.org/3/library/functions.html#int)*]] | None*) – Coupling map.
- **basis\_gates** ([*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str)*] | None*) – Basis gates of the backend.
- **qubit\_t1** ([*float*](https://docs.python.org/3/library/functions.html#float)  *|*[*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*float*](https://docs.python.org/3/library/functions.html#float)*] | None*) – Longitudinal coherence times.
- **qubit\_t2** ([*float*](https://docs.python.org/3/library/functions.html#float)  *|*[*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*float*](https://docs.python.org/3/library/functions.html#float)*] | None*) – Transverse coherence times.
- **qubit\_frequency** ([*float*](https://docs.python.org/3/library/functions.html#float)  *|*[*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*float*](https://docs.python.org/3/library/functions.html#float)*] | None*) – Frequency of qubits.
- **qubit\_readout\_error** ([*float*](https://docs.python.org/3/library/functions.html#float)  *|*[*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*float*](https://docs.python.org/3/library/functions.html#float)*] | None*) – Readout error of qubits.
- **single\_qubit\_gates** ([*List*](https://docs.python.org/3/library/typing.html#typing.List)*\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str)*] | None*) – List of single qubit gates for backend properties.
- **dt** ([*float*](https://docs.python.org/3/library/functions.html#float) *| None*) – Discretization of the input time sequences.
- **std** ([*float*](https://docs.python.org/3/library/functions.html#float) *| None*) – Standard deviation of the generated distributions.
- **seed** ([*int*](https://docs.python.org/3/library/functions.html#int) *| None*) – Random seed.

## Attributes

### options

Return the options for the backend

The options of a backend are the dynamic parameters defining how the backend is used. These are used to control the [`run()`](#qiskit.providers.fake_provider.ConfigurableFakeBackend.run "qiskit.providers.fake_provider.ConfigurableFakeBackend.run") method.

### version

Default value: `1`

## Methods

### configuration

`configuration()`

Return the backend configuration.

**Returns**

the configuration for the backend.

**Return type**

[BackendConfiguration](/docs/api/qiskit/0.46/qiskit.providers.models.BackendConfiguration "qiskit.providers.models.BackendConfiguration")

### defaults

`defaults()`

Return backend defaults.

### name

`name()`

Return the backend name.

**Returns**

the name of the backend.

**Return type**

[str](https://docs.python.org/3/library/stdtypes.html#str)

### properties

`properties()`

Return backend properties

### provider

`provider()`

Return the backend Provider.

**Returns**

the Provider responsible for the backend.

**Return type**

[Provider](/docs/api/qiskit/0.46/qiskit.providers.Provider "qiskit.providers.Provider")

### run

`run(run_input, **kwargs)`

Main job in simulator

### set\_options

`set_options(**fields)`

Set the options fields for the backend

This method is used to update the options of a backend. If you need to change any of the options prior to running just pass in the kwarg with the new value for the options.

**Parameters**

**fields** – The fields to update the options

**Raises**

[**AttributeError**](https://docs.python.org/3/library/exceptions.html#AttributeError) – If the field passed in is not part of the options

### status

`status()`

Return the backend status.

**Returns**

the status of the backend.

**Return type**

[BackendStatus](/docs/api/qiskit/0.46/qiskit.providers.models.BackendStatus "qiskit.providers.models.BackendStatus")